Touhou Project mobile games haven't been as successful as expected.

Lost Word, which is currently on the floor. This can be seen as a very long-lived, unique case. "Touhou Cannonball", released around the same time, went bankrupt due to deficits after just one year and service ended. "Touhou Danmaku Kagura", released later, also struggled with deficits, leading to the addition of rewarded ads, before ultimately meeting the same fate of service termination..